Feed-valve device



'Mamh 1931. c. c. FARMER 1,797,410

' FEED VALVE DEVICE Filad April 2, 1929 MAIN'T.

MAN 3 BRAKE 7 FEED FEEDVAl-NE 6" CONTROL- IO N INVENTOR CLYDE C.FARMERBY ATTO2EY Patented Mar. 24, 1931 STATES,

PAT NT OFFICE oLYiJE. o. FABMER, or PITTSBURGH, PE SYL ANIA, s'srGNoR'ro 'rHEiWEsTINGa "HOUSE Ara BRAKE COMPANY, or or PENNSYLVANIAW'ILMEBDHTG, rnNNsYLv IA; A eonroaA'rIoN F EDQVALVE DEVICE Applicationfiled April 2, 1929. Serial o, 351,840..

tive, which is operative when the brake valve device is in runningpositlon, tomalntam the brake pipe pressure, against leakage, at the l0predetermined degree of pressurenormally carried in the system.

Ithas also been proposed to provide a maintaining valve device wh ch isoperative to malntainthe brake plpe'pressure, when l the brakes areapplied, at a predetermined degree corresponding, with the reduced brakepipe pressure as .efiected by operation of the brake valve device inefi'ecting an application of the brakes.

One object of p a single valve device for maintaining the brake pipepressureboth while the brakes are 7 phragms 22 and 23-is connectedthrough a released and when the brakes are applied.

Other objects and advantages will appear 25 in the following moredetailed description of the invention. r

In the accompanying drawing; Fig.;-1 isa diagrammatic sectional view ofa brake yalve device and a brake pipe pressuremaintaming 30 valve deviceembodying my invention; and Fig. 2 a diagram, showing the portconnectionsfmade when the brake valve device is v in the specifiedpositions.

The brake valve device 5 usual typecomprising casing sections-and slidevalve 8, adapted to be operated by'a handle 4. Mounted in the casing isthe usual equalizing discharge valve mechanism'comprising a piston 5 anda discharge valve 6, adapted to be operated by sa1d plston.

' Thechamber 7 at the upper side of piston 5 2 is connected throughpassage 8 with the usual equalizing reservoir 9 and chamber 10 at the ltand passage with the rotary valve my invention is to provide 1 may beof the as'sa e 36' to i 'e 37 leadin to th "lie (1 having avalvechamber2 containing a rotary p pip e e opposite side is connectedthrough passage- 11 that the Valve i b unseated- 9 with the usual brakepipe 12., The usual main reservoir 13 is connected through'p'ipe;

vention, the combined feed and maintaining valve device may'comprise asupply portion 16and a regulating portion'l7. The supply portioncomprises a piston 18 contained in piston chamber 19, and a supply valve20 contained in valve chamber 21, and adaptedto be operated by. piston18. The regulating portion comprises apair of'fiexible diaphra-g'ms"22and 23, the. diaphragm 22 being preferably of smallerare'a than-thediaphragm 23 and being adapted to operate a valve 24forvarying thefluidpressu're in piston chamber'l9n Afollower plate .25'engag'es theopposite side of diaphragm 22 and is provided'with a stem 26 inoperative engagement with the diaphragm 23; A follower plate 32 at theopposite side of the diaphragm 23 is engaged by an adjustablecoil'spri'ng 27 and the pressure of said springon the diaphragm may beadjusted by means of a screw plug 28.;

The chamber 29 intermediate the diavalve device, "and said pipe isconnected, tl1rougl1 passage .38, ;with diaphragm cham f ber 39..Thediaphragm 22 is thereforesub j-ecti to brake pipe pressure, and ifthepres-v sure inflthe. brake pipeshould. fall below a so predetermineddegree, as determined by the setting of the spring27, the diaphragm 23and I the diaphragm 22 will be deflected upwardly,

The valve chamber 21 is connected'througli pipe 40 withthe mainreservoir 13 a-nd fluid under pressure equalizes from-valve" chamber 21,through passage 41: and arestrictedport 42. into piston chamber'19,permitting the we spring 43 to maintain hand position.

When the valve 24 is unseated, fluid under pressureisvented fronrthepiston chamber 19; through passage 44, and past the valve 24: to passageand the pipe 37, so that the higher pressure in valve chamber 2l shiftspiston 18 and sllde valve 20 toward the right, until P rts. re i ter W tPa sages 46 a e flu d under pressure from the valve chamber. 21 and themain reservoir'13 is supplied to the pipe 37 and through cavity 35, inthe rotary valve 3 to the brake pipe. I I

When the brake pipe pressure has been inpiston 18 in its left creased byflow from the main reservoir to a degree sli htly exceeding. theopppsingpres..- ire i e$1l ng the diaphragm 221s deflected downwardly permittingthe valve 241-; to heseated by spring 47..

The flu d pressures on opposite sides ofthe piston 18- then equalizethrough thepiort i2, so that the spring 43; operates to, move piston18;. and slide valve2O to. the left, so as to. cut.

off the further 519W Of fluid under pressure to th ebrakepipe.

The feed and maintaining valve device then operates the same astheTusualfeed valve device heretofore employed tov maintain the pressure in thebrake pipe against leakage \vlnlethe. br-akejvalve. device remains inrim .1 g p s t oni I n running position, the chamber 7? and: the. qua zig re erv 9. a e harged with. fluid: at brake pipe pressure, throughpassage. 48;; ev y; ea in r ary v ve 3' a d Pas age 0, and when the.brake vaLve. device is'turned to service application positiomacavityin hrotary, valve 3 onne ts. ch mber 7; .ivith the tmc pli 'e so ha fluidunder p essure. svented from chamber and from the. equal-, mingreservo rin the. usual manner untihthe pr su e hasbeen e u ed t the de ir de.gree, when the brake. valve handle maybe turned tov mainta ing.position, if i is desired tov maintain the'brake pipe, pressure at he pedetermined. re uced degree ofpres. sure.

he re eei: P ss r n chamber causes the piston 5 to bemoved upwardly bythe higher brake pipe. pressure in chamber. 10 so that the dischargevalve 6 is unseated to,

vent fluid under; pressure from chamber. 1O

; and the brake pipe, until: the brake pipe pressure in chamber 10 hasbeen. reduced to a feesl ght y f h j he r lin P es ur in chamber 7, whenthe piston 5 operates to move the valve 6 to its seat and cut off thefurther venting of fluid from the brake'pip e. in-the usual manner. i iv In the r na;i-ntaining position of the brake valve device, passage 31isconnected, through a cavity 51 in the rotaryivalve.Envith passage 50,Wh le. the feed valve. passage. 36-remains connected to. brakepipepa-ssage 1:1.

Flu d atequalizing reservoir pressure is therefore supplied through pipeto chamber 29 of the feed valve device in the maintaining position ofthe brake valve device, and the area of diaphragm 23 is such that thispressure will deflect the diaphragm 23 downwardly against the opposingpressure of spring 27, so that the diaphragm 23 Wlll not act throughstem 26 on the diaphragm 22, and consequently the operation of diaphragm22 willnot be influenced by'thc pressure 'of spring 27.

The diaphragm 22 is now subject to and is controlled by the equalizingpressure in chamber 29 and the pressure of a biasing spring 52. Thespring 52 acts on the diaphragm 22 with suflicient force to. compensatefor frictional resistance of the parts to movement, the pressure ofspring 47, and var ations in the initial deflection of the diaphragm 22.The spring 52 should therefore preferably he adj usted to'halance. the,aboye forces for the individualfee d valve device and the spring may be.adjusted in any. desired manner, such as by the use of one or more shims3, p sed be e h e -mam 23 and the end of the spring.

If there is no leakage, the reduced brake pipe pressure acting. ondiaphragm 22 in chamber 39 will be the sameas the equalizing reservoirpressure acting on the diaphragm in chamber 29 and the valve 24; willthen be held seated by a slight preponderance of the springi'l. r

If,-however, the brake pipe pressure should fall below the bottled uppressurein the equalizing;reservoir 9-, asby leakagefrem the brake: Ppe, hen. t e i p sssur m chamber 29;.Wil'l on the diaphragm 22 so as tolift the. va v 2 rom i e t and. ther by a se-the Qperat e he upp y sreen f, the feed valve device to supply fluid under Pressure. the b eke-Pire t mpensate o the loss-in pressure, in the samev manner as describedin connection with maintaining the brake pipepressure in running postion.

The same valye device is'tlius. adapted to.

maintain the. brake pipe. pressure both when the brakes are releasedand, whenth e bra lges are applied.

Vhile one lllustrative ci lb-Qt i e lh til? -ins sep ly Qffii i nde-Pressure. t9

thebrake i and a sheev ce t we: trolling h operat i id v lvesaidvalvedevice being subject at onetime to the opposing pressures ofthe brake pipe andi a, substantially constant pressure. and ht a mothertime to the opposing pressures of the brake pipe and a pressurecorresponding with controlling the supply of fluid under pressure to thebrake pipe, aspring, and a valve device subject at one time to .theopposing pressures of the brake pipe and said spring for controlling theoperation of said valve means and subject at another time to theopposing pressures of the brake pipe, and a fluid pres surecorresponding with the pressure to which the brake pipe is reduced inapplying the brakes.

3. In a fluid pressure brake, the combination with a brake pipe, ofvalve means for controlling the supply of fluid under pres sure to thebrake pipe, a spring, a valve devicesubject to the opposing pressures ofthe brake pipe and said spring for controlling theoperation of saidvalve means, andvmeans operated in applying the brakes for cutting outthe action of said spring on said valve device. 7

4. In a fluid pressure-brake, the combination with a brake pipe, ofvalve means for controlling the supply of fluid under pressure to thebrake pipe, a spring, a valve device subject to the opposing pressuresof the brake pipe and said spring for controlling the operation of saidvalve means, and means operated in applying the brakes for preventingsaid spring from acting on said valve device.

5. In a fluid pressure brake, the combination with a brake pipe, ofvalve means for controlling the supply of fluid under pressure to thebrake pipe, a spring, a valve device subject to the opposing pressuresof the brake pipe and said spring for controlling the operation of saidvalve means, and means operated in applying the brakes foreliminatingthe action of said spring on said valve device.

6. In a fluid pressure brake, the combination with a brake pipe, ofvalve means for controlling the supply of fluid under pressureto'thebrake pipe, a valve device subject to the opposing pressures of thebrake pipe and a substantially constant pressure for controlling theoperation of said valve means, and

I means operative in applying the brakes for subjecting'said valvedevice to the opposing pressures; of the brake pipe and a pressurecorrespondingwith the pressure to which the brakepipe is reduced inapplying the brakes.

7. In a fluid pressure brake, the combination with a brake pipe,a'reduction in pressure in which, effects an application. of the brakes,of asupply valve device for controlling the supply of fluid underpressure to the brake pipe, anda regulating valve device for controllingthe operation of said supply valve device, and regulating valve devicein cluding a flex'ible'diaphragm subject to" the opposingprejssures ofthe brake pipe and a spring, and means operated .by fluid. at thereduced pressure in thefbrake pipein applying thelbrake's foreliminating the action of;

said spring, on said diaphragm..

8. In a fluid pressu'rebrake,

the combination with a brake.'pipe, a reduction in pressurein which,efl'ects-an application of the brakes, of'a supply valve device forcontrolling the supplyof fluid under pressure to the brake pipe, and aregulating valve device for controll ng the operation of said supplyvalve gdev1ce,'sa d regulating valve device including a flexiblediaphragm subject to the opposing pressures of the brakelpipe and aspring, means for subjecting said diaphragm toa fluid pressurecorresponding with the reduced pressure in the brake pipe inapsaiddiaphr'agm, p i I p 9. Inafluid pressure brake, the combinationwith a brake pipe, ofa supply valve de 7 vice operated by a reduction,in fluid pressure for supplying fluidunder pressure to thebrake pipe,avalve for venting fluid pres sure from said valvedevice, a flexibleregulatinggdiaphragm, subject on one side to brake pipe pressure foroperating saidvalve, a second flexible diaphragm operatively connectedto said regulating diaphragm, a springacting on said second diaphragm,the pressure of which'is transmitted through the second diaphragm to theregulating diaphragm, and means for supplying fluid under pressuretosaid diaphragms in applying the brakes to subject the regulatingdiaphragm to fluid pressure and to move the second diaphragm out'of itsoperative connection with the regulating diaphragm.

10. In a fluid pressure brake, the combination with a brake pipe, of anequalizing reservoir, a valve mechanism operated upon a reduction inequalizing reservoir pressure for effecting a reduction in brake pipepress sure,a brake valve device for effecting a reduction in equalizingreservoir pressure, a feed valve device comprising a supply valve devicefor supplying fluid under pressure to the brake pipe, anda regulatingvalve device subject to the opposing pressures of the'brake pipe and theequalizing reservoir in applying the brakes for controlling theoperation of i mem brake p pe feed and ma nta ni g va d vice comprisingvalve, means. for controlling the supply of fluid under pressure to thebrake pipe, a Valve for controllingthe operation of said valve means, aregulating diaphragm subject on one side. to brake pipe pressure foroperating said valve, spring opposing brake pipe pressure on said dia-;phragm, a second diaphragm interposed be- 10 tween the regulatingdiaphragm and said spring, andmeans for connectingsaid equalizingreservoir'to said diaphra ms, whereby the regulating diaphragm issuldjected to the opposing pressures of the brake-pipe and the 15equalizing reservoir and the second diaphragm is; operated to releasethe regulating diaphragm from the pressure of saidspring. 12. In afl-u-id pressure brake, the combination With a brake pipe, Of &, f68dand main- 20 taining valve device 'for controlling the supply of fluidunder pressure to the brake pipe comprising a, supply valve deviceoperated by a reduction in fluid pressure for supplying fluidunderpressure to the brake pipe, a valve for venting fluid from said supplyvalve device, a spring, a regulating diaphragm subj fectto' theopposing-pressures, of said; spring and the brake pipe for operating 7said valve, and, a biasing; springalso acting :10 on said diaphragm, v

In testimony whereof I' have. hereunto, set my hand this. 19th day ofMarch, l929.

V CLYDEC. FARMER-v

